材料的力学性能是指材料在外力作用下,表现出来的抵抗变形或破坏方面的特性。最典型的特性有弹性模量、屈服点、规定非比例伸长应力和抗拉强度等。规定非比例伸长应力又名“比例极限”,它是一个临界点,超过此临界点,应力与应变就不再保持线性关系;而在此临界点范围之内,应力与应变就保持线性,满足胡克定率,所以σ_p代表的实际上是 Mechanical properties of materials refers to the material under the action of external force, showing resistance to deformation or damage characteristics. The most typical characteristics of elastic modulus, yield point, the provisions of non-proportional elongation stress and tensile strength. The nonproportional elongation stress, also known as the “Proportional Limit”, is a critical point above which the stress and strain no longer maintain a linear relationship; and within this critical point the stress and strain remain linear, Meet Hooke’s rate, so σ_p stands for actually